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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2280cc682717dfbe8d70dd2c10ea0c03d7f3572d95de712d41d19b2711592ac6' 
  AND token = 'HnH1jX3EPDBqUY2tjujUd6nHUBF82sEN/E/r1gjkGXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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