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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fe19ccd2c1ce97c50ceb30d6a3bd855d94ca1a6f0cf74e9cb9a8aeabc54dcd' 
  AND token = 'fNQNEygY8V8WqoOS/R5MR0NSTm/SCzTfMwv86MVY1GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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