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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aefec3507d33da9d6d35d78f2ab69f5616384928cd7895f46b699c29e63d533' 
  AND token = '5wFYtTbU1yJyQIWWCyEB+63ZXEe07WTlHLbyY8mYCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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