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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a42c6cb6e1e52ab9216702c1500d275835dd1499943dc1fdafe4a53787788a5' 
  AND token = '/Z9nYL2w3zSXkbomevL03/oBRC7E/C43LQQnWm2SH3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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