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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e77260efba5357d591048054af09b7489a1926a3751e90aea274e55186832c' 
  AND token = 'oIitrz8L3LRJY00BFxeu+r96kxndg/K9eNTSpPfId7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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