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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e6bf70cd18df2380cc21a9a31a9e5ff35ddadcf0a4bcfe43d5f46e24d041b9' 
  AND token = '8yAIMl2Aomdm7jPTKTmsVrjZ9uz/UJeCRNoGVvdIEdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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