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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7bfdc999539130a465c5050b488e0844f477400e7f4f37204d9af3d8fc2e27' 
  AND token = 'cFC8bcFEkVbBUg1cCHQs0jnksBe1S5T1C6OtgujePvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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