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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3746cdd9fa53ab10f044bd8a30dbcf53759c4728060bf60742f9e75c3fbd99f7' 
  AND token = '63kHvV5FlFSLPk4JPKjDZNr6fxUbg3PbP3ZYfcSDV1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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