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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313973426e6bf205bfffc3400f24f8c0d40f350d6ff3686c529ac9ce650c2a4f' 
  AND token = 'GAu78DQu5i7Faah3gbs+t2VpBtuHAXf2LIPiem375RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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