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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc447044a262447dd2c965dffb09a05c2c76286f06e4e3c875bd0c2332bdf92c' 
  AND token = 'eKoyRj4cXbnISVVhvVTMasx1X6C/+OKNlt4rrVM6IUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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