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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c76c175275ab380be3b5beae523431d3c0bbacbbb037414902bd85360d2bef' 
  AND token = 'AUBDkazTDG+Gv9b2yDMbaXKBu6dtfgrgwUjfC3nSWMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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