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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b558b361d2b129e273442622e4ce47312ac4fd5b0e38cb432b6c58ac7f9a8c1' 
  AND token = 'XjNNjZJo8T4OAGhml0Iav9cXMp7wfFszYMAWeZMNlOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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