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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ae8b4e4307aa0d5946767b971a07f9e61f4701883f0b5fb05eb19b979fec99' 
  AND token = 'UbEgc2aOIsfKVz4cyi7hWzbr3XfwuCdlI+iW/83JjyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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