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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36d7ab717dd16e68bc06656022c281e9525f4e66d052fff3f5ada801bcc8847' 
  AND token = 'Ax1C8/hads/43cnQsktTxOYVAkPogoNOVpBb+eUYgxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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