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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ef8accc16b94e383fb0d0f61f8184b1e76a2b53c223046e13a89fe0d3d9ef0' 
  AND token = 'ye4A+VeetKJ8i1e03DPIiFTSDzN+12/U2yqJI8nO53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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