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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4798fc1975e3e4d67f9a5f7b2e3905df1d607f4edabc20a850ba80eb0aa9ab' 
  AND token = 'KEtCFn50YQ/xJCYcv03dWPOnAW+9F7bKJldw2z+dZMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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