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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14325ab5726060ce769eb34773270c44e66f62c0bcd32460e73bda518c4039e6' 
  AND token = '6TviGGQBmzoeZtY8PqNxoraHDvRsAJyAz3aMvpNsSCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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