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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6fb4afae4eef18e70d937d636cb53a707725da9f06029ce6f6e9722d4587b7' 
  AND token = 'aBNcDFx+jQuZ46mE1avaWgWsJxTJ6OIqvEpF6lceKLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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