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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f613eabdbf88cc3b2dbb50ab0e809f0f58712ced580434fb07c82a9cc1cc5fae' 
  AND token = 'S3nI2LWkZ292ZfRp5nCNRQAyP2rxeraOVO19g1RawvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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