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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8761c302a4f5fb22ed1b076e423a53f3146ddc29bc319e4ad77ce752267a56e' 
  AND token = '6fiSrSpLNAuzQoVYuTyXvTVJPJMQUbW2ynkCF0RNXP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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