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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a69b8b86adec567e1df85ad2ad630e53643fb99176d2b989c4a95f30e6f6d3' 
  AND token = 'pnXpdOCq6lII+E7vYPJ7cx6uUvDntfYFTAZshEPoPLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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