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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c231284ba3f7470e9f89f737f0f74273aca5566b9b78d38e2e7ef5098678bc7' 
  AND token = 'fOlgm4jatEo8dMSSLVm+lGTQkqWuSlMceQ5e/vm9SHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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