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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69f02a62cc62bd8977a9033341c40a01ad4f5ade212e1c8d1b9b87ef42edd58' 
  AND token = 'jJ++4V6y88N7bOg9fcOjq+8M5jndrqaEtwM1wSYuL58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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