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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56dad61bdf6eb0549eae46ec7df1606c5abbd7ff5b4c8c93dcf8b3147135523' 
  AND token = '8wibQBx/7OWpqstb4vH8k/d8dUpmBThRmtW8MG0DGAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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