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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43ee96ede782219b1749dd64d836637f3d4ad825a55570a1ca5715b0378cc4c' 
  AND token = '7RWkSIJWObW5+7bDhwiy68tMWQIOn5uBOmn6NiYFUGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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