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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82038ed9f3f2577e6f43f4b01e894fc494cda2293ff9dd9c1a929c66db380fb5' 
  AND token = '0aaeqn025NWkI/f7mFkJNJHzKSluQKr0DSdgB+Bj4Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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