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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae29d04a05e6ce22be3b133897d730da76e4d52919c29164f373363257c4e32' 
  AND token = 'x4uY5qahCut3PVS51DuOcD0s6e92Jo2HsdQqDbC53Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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