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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea78f80c2dcb4add0baac7d904c0e8b97afa1fcf8a457ee9238651d494f30d0' 
  AND token = 'OGyibEM4ZjbDsGknzGqRbqp42lflpZ1prVkYdH/hYgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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