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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82507bb01c97b376fb9e29949bda37d1da0b4bfe87e05e53b01ea0e695a1d8a5' 
  AND token = 'mSE1irMVyjmF3UESq4/wWYV24XaA3ya2E8ubb7eUXEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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