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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bc01e0d46b7867ccfa68c16568add8b965ce214558ed683d213835bc3b11c2' 
  AND token = '3OCSFh2Cnx9MdEskpldSgvO+DRvhu1yjcb6/cVYu86k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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