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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c2841c7bf279c1a6aab44dfe6159d9df40b14ebe76e918a9cf45bb46aff003' 
  AND token = 'b1lRPezDUac5s/FCdHwjSYVD0g5VKxEwcgmy8Z438ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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