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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3032cb5ff8fbeae3600e2c4b0be20815939fe0919ac7765daf43b7d0faa957' 
  AND token = 'emQNkqiWD2TrqlbESs2NRlO83NJItsNgPvowR8DQWyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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