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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fdf0515041cbca372de0b31e74e5c76884fae8a8cfab4b4ad175d74d27be12' 
  AND token = 'XZ8dM9a8rqgFIOtgFzXZDmrL8DrAZL0XKoSTjmn4QxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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