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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbabd31f7a03bb2e8a50ac3b6bbeded0e8e559b96f5836ae2bac5f2e82db4fe' 
  AND token = 'iHiFVuoqgGlfJRlj8Ml+7U/EBLwY+1Piw2Yj7HSYPQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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