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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf013f2083beb3aa0692feb1a566c7ea09b5bfd3d39ad4d1f7030d6425c84b' 
  AND token = '0pzMHc/btR4ew7R+JFXaXS7DYRqoaUvcPV4/o9gP5wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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