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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946ee7155e418abc44420c36a34ba3c4d6d3d88fba092bc66d85e4b7d2a9b69f' 
  AND token = 'm/zUyd/yiMlyPUydlaYkSKTUQjebhfj9I95RtXuSjbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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