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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecd02de8b890bd483a97f7b81756eb893c95e18a87fb6ac9196c204bede90a4' 
  AND token = 'kI6X7TgD9O2Bb6VtvPYi9ks2wgz8Iw62hpz0Xy6d3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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