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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ffb2d74aa5e61c0645e6d99c211a4bc77241d0d1f7f62968c02cc15eb71ff1' 
  AND token = 'hs+gWZU+kPYYhYrKted0BgYdnQDQ1sgFrBcFKujjI2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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