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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a755339ef47ea0a889ddd2ba03250a6968d29e8078ce2fdba45d421ab2bc6ed' 
  AND token = 'rySeX8EusOQ8Vwwq5+Z17/St8x9if4L40FIgyLbPRBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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