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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532103bed7e8c42bbef87a08b9786ae12ed7a7e076077ec3a800eaa08e8defc5' 
  AND token = 'j/unVngd4Xln/abCdPGZmw/pS74H71bMIyOFQzB4TXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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