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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9dc46897ca787e185dfeec899e2034b9e81c15244938a71884bf2b42d9f182' 
  AND token = 'pdpmeVklJ+G2sPbshUiVK+e084hWehQqrLRCwK9bS/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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