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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15270d1c8dffeaa02ae3dd4da560c1df6413761e5cfc82a126f6ce73b9b7019' 
  AND token = '3ePXNRra2WdaY014o35ow2yYSdzY/pYns9CNFk9T2SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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