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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b65ccd6c1316bce6fafff5b0b34a5c41cd8bb893e0d94bc30c15d4d9b9baf78' 
  AND token = 'nbV7lgb343YhOdbaZDJ090iJSCwKtxd4Y5bmAlXVl6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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