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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2fefb06ba0bc86750bad960b0cc6475c86371548bd64c3c69707428d67cf79' 
  AND token = 'YBYd5E9uoLy8WGovDO88+3y1U78F0Q+GbKJxoe2i97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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