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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bdb49f2ba5c16a60c3168ff9a0d7e19ec052b6c0681d3fef625c1e0f1a745c' 
  AND token = '7PLBf5sfAqT17cD9DxjPoEVAV7p8Qb9LrUNVNWyosvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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