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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34deca6bf908932426b063a4cd208201fe7f964c19e913dcbe036d54654c9ae' 
  AND token = 'uwydHOfLkMCqlbpzLYfCqXz7lSmkuOW84YRU8AX2qe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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