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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7eafd351875e7ab9e6756a9e5f20463d6149bedd63ccc61ecbe8dcd9ca6dfa3' 
  AND token = 'OS9kTyJPyfnpK1TLTf5Ip1kbjriihhnD5RIUNhHMI98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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