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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ec728e272a9b0022eaebf18ca51f3be7e68936b3ae11685996db7991f017d4' 
  AND token = 'Bq15aFWQ3NuyTZDQ+NpmWSQgKkhEpBlC46alUeJth/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}