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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05be21ae2979a6eea22c70b74b7952423eea0ba7198b6bc08fef7bd33f91dec' 
  AND token = 'LpGB0EbJZcSsLHjamswm7vwqGh3Z0QWwOo4aw4s5DHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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