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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b118c157a28fd7893894cdd9ccf2dc0b31fe613b482c5737563e3709fc026015' 
  AND token = 'z69WRKiSp2IBO03E7xT8KhPPQ82a+JMma5ys81jgnTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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