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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b05757a7d7b055e7c04a94c94bcf779ce7af0799afbfa5b6385156198698a38' 
  AND token = 'GarhtkuP8D5dg7vA+6R70Ac4xgORatLqloMlNcAu114=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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