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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95d3656861e978a9535ab37a5a824a54753ae39df69febe4684446e49a2fa7c' 
  AND token = 'SImpr0pjWnp7prX8QlhoyfVOnXHyI+amG/Zpu0Ug+jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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