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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d77214e0e1fc543c9976b77c549321150ec8428f55db51707f7e6c485fd8ec' 
  AND token = 'qy5bSiglOXcdF/IKt6bIDodzYw8v3NgnVwTkDTmY7pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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