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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6541f54606e557599b1c2f3eb9377c489074f7002b0de928a7e1ca049a353e47' 
  AND token = '0Fk9qZDEpv5ablu0E+PgYL/JtLlfl1piDnb5vaCvma8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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