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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a09d76bb81da7a849a670a65304d31c1578265704fb485a1b5a2179ddbdf11' 
  AND token = 'QE8NJ9O1jVPdHnDlctJMLHOt3J4wqr+hA6dwr0m8KxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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