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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97422b4938a4e71e085e44907c70527d2991774db9477763fa25f75907883454' 
  AND token = 'cS0hLp62c6/+9mP9cfnY9k83jPpc68zJssah0OomFFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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