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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2abb20ea67a65222ee9cc838e1cf8c492fdb7a30d9c2e74ad833ebbd5c0cb7' 
  AND token = 'JqTDZGeGRllkwr0rvDR+UQYk9GYg6QW8sneElPhdhDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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