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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aeeaa7f83f5f640a707941be5dfc26ac59c41453f1bc4637dcdd95ed026e2c8' 
  AND token = 'FnXajkQ5qMyCbbW8sCJDvF9NjQ0U5JBiq0i+wvhQOHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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