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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfead76b765f0899447d8adb5523b5489c576924d93dec7e68ec7b5d297957a' 
  AND token = 'IzBdLG/idIUw09yac3QGJD4kRHcH9TsW9xi3M+HuX3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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